JPH058544B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a liquid-cooled cathode ray tube device in which a cooling medium is sealed on the outer surface of a phosphor screen panel, and in particular to a liquid-cooled cathode ray tube device that absorbs thermal expansion of the cooling medium due to high input. Accordingly, the present invention relates to a structure of a liquid-cooled cathode ray tube device suitable for reducing the stress load acting on the sealing portion of the cooling medium and improving the reliability of the structural strength of the sealing portion.

[Background of the invention]

In a projection television, a method of obtaining a high-brightness screen is, for example, as disclosed in Japanese Patent Application Laid-Open No. 58-162185 (see Figure 6). A light transmitting panel 4 is placed facing each other with a body 3 interposed therebetween, a sealed space is formed between the panels 1 and 4 using an adhesive 5, and a light transmitting cooling medium 6 is sealed in this closed space. The heat generated by the phosphor screen due to the electron beam irradiation on the panel 2 is radiated to the outside from the metal frame 3 through the natural convection of the cooling medium 4, and the thermal expansion of the cooling medium 6 is controlled by the elasticity of the adhesive 5. A liquid-cooled cathode ray tube device that absorbs light is known. In FIG. 6, reference numeral 7 indicates an electron beam emitting section, and reference numeral 8 indicates a deflection coil.

In this conventional liquid-cooled cathode ray tube device, since the fluorescent panel 2 can be cooled uniformly to some extent, it is possible to reduce optical problems such as temperature quenching and color shift. Since the thermal expansion of the cathode ray tube body 1 is absorbed, the danger of damage to the cathode ray tube body 1 is prevented in terms of strength, and as a result, it is possible to achieve high brightness due to high input.

However, this conventional device uses a method in which the thermal expansion of the cooling medium 6 due to heat generation is absorbed by the elasticity of the adhesive 5, which is a sealing member of the cooling medium 6. Tensile stress acts inside, and the bonded portion is placed in a severe condition in terms of strength. Therefore, depending on the usage conditions, the adhesive part may burst and the cooling medium 6 leaks out of the sealing part, which not only makes it impossible to maintain the above-mentioned good optical properties, but also causes the leaked cooling medium 6 to leak into the high voltage of the television set. There is a risk of accidents such as fires occurring if the product adheres to the parts.

In addition, this conventional device has an optical problem that even under normal usage conditions, the positions of the fluorescent panel 2 and the light transmitting panel 4 change relative to each other due to thermal expansion of the cooling medium 6. There are also problems such as the optical positional relationship including the optical position becomes unbalanced.

As a solution to these problems, the
As disclosed in Japanese Patent No. 177256, a method for preventing a pressure increase in the sealed space by communicating the sealed space formed between the fluorescent panel 2 and the light-transmitting panel 4 with a bellows provided outside. However, the device is large-scale and there are problems in terms of space for incorporating it into a television set.

[Purpose of the invention]

The present invention was made in view of the problems of the prior art, and its purpose is to absorb the thermal expansion of the cooling medium and prevent the cooling medium sealing part from breaking.
The object of the present invention is to provide a liquid-cooled cathode ray tube device that has high reliability in terms of structural strength and high brightness.

[Summary of the invention]

A liquid-cooled cathode ray tube device according to the present invention has a watertight space formed on the outer surface of a fluorescent panel of a cathode ray tube body, in which a light-transmitting cooling medium is sealed, and a gas is sealed therein independently from a sealing member. It is characterized by being provided with a compressible member.

According to the above configuration, the gas enclosed in the compressible member contracts and absorbs the thermal expansion of the cooling medium due to heat generated by the fluorescent surface panel, thereby relieving the stress applied to the sealing member. Since the compressible members are independent from each other, there is no leakage of the cooling medium due to peeling of adhesive parts with other members or damage to the compressible members due to the contraction and restoring operations of the compressible members, resulting in high structural reliability.

[Embodiments of the invention]

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a first embodiment of the present invention.
In this figure, a transparent panel 12 is placed in front of the fluorescent panel 11 of the cathode ray tube body 10 at a predetermined distance.
A metal frame 14 having an L-shaped cross section and made of aluminum or the like with excellent heat conduction properties is provided, and is made of aluminum or the like and has an L-shaped cross section and faces the space formed between the panels 11 and 12 at one side edge.
However, the adhesive 16, 16 that functions as a sealing member
A, 16B fixes between both panels 11, 12, and between these both panels 11, 12 there is a watertight space 1 whose outer periphery is sealed with adhesives 16A, 16B.
8 is formed. An endless silicon tube 20 filled with air is disposed at the boundary between the watertight space 18 and the adhesive 16A, and the contact between the adhesive 14A and the watertight space 18 is cut off. Further, this watertight space 18 is filled with a transparent cooling medium 22 having excellent heat conduction properties, such as an aqueous ethylene glycol solution.

The manufacturing procedure of the liquid-cooled cathode ray tube device according to this embodiment will be explained.

First, a predetermined amount of the adhesive 16A is applied to the vicinity of the outer peripheral edge of the fluorescent panel 11, and the tube 20 is placed on the inner periphery of the adhesive 16A, and the metal frame 14 is adhered thereon. Next, adhesive 16B is applied onto the frame 14 to adhere the panel 12.
After that, the cooling medium 22 is injected from the cooling medium inlet 15 formed in the frame 14 to fill the closed space 18.
The operation is completed by filling the cooling medium 22 with the cooling medium 22 and closing the inlet 15. The end surface of the protruding part of the frame 14 that protrudes into the watertight space 18 becomes a heat receiving surface 14A that receives heat in contact with the cooling medium 22, so the adhesive 16 is attached to this surface during adhesive bonding work. Although it is important to be careful not to reduce the heat transfer efficiency, since the tube 20 has a function of preventing the adhesive 16A that has not yet hardened from flowing into the watertight space 18, the adhesive 16A is applied to the heat receiving surface 14A. will not stick.

Next, the function of this silicon tube 20 will be explained.

The heat generated in the electron beam irradiation section 11A of the fluorescent panel 11 is transferred to the cooling medium 22, and is transferred from the cooling medium 22 to the outside air via the metal frame 14, or to the metal stay (not shown) connected to the metal frame 14. heat is transferred to and dissipated. When the cooling medium 22 receives heat, convection as shown by reference numeral 23 occurs, and due to this convection, the electron beam irradiation section 11 of the fluorescent panel 11
The heat generated at A is efficiently transferred to the metal frame 14. At this time, the cooling medium 22 increases in temperature and expands, but as shown in FIG. 2, the tube 20 is pressed by the cooling medium 22 and dents, and the adhesive 16A
The load applied to 16B is reduced.

Therefore, the durability of the sealing portion of the cooling medium 22 is improved, and optical problems such as a relative change in the distance between the panels 11 and 12 are also eliminated. As a result, it is possible to increase the input power and further increase the brightness than before.

FIG. 3 shows a second embodiment of the present invention, in which an adhesive 16 forming a sealing part for a cooling medium 22 is used.
An endless silicon tube 20 (20A, 20
B) is provided.

According to this second embodiment, it is possible to more effectively absorb the thermal expansion of the cooling medium 22, and it is possible to further reduce the load generated on the cooling medium sealing portion. Further, according to this embodiment, the adhesives 16A, 16B are cured until the adhesives 16A, 16B are cured.
16B flows into the watertight space 18 from tube 2.
Since it is blocked by 0A and 20B, the frame 14
The adhesive 16 is reliably prevented from adhering to the heat receiving surface 14A.

FIG. 4 further shows a third embodiment of the invention.

In each of the first and second embodiments, the panel 1
An adhesive 16 is attached to the opposing surfaces of tubes 1 and 12 to form a sealing portion, but in this embodiment, an adhesive 16A is attached to the outer surface of the tube body 10 to form a part of the sealing portion. is formed, and is characterized in that by enlarging the heat receiving surface 14A of the metal frame 14, the heat dissipation effect from the cooling medium 22 through the metal frame 14 is enhanced. Furthermore, in this third embodiment, since the watertight space 18 extends to the outer peripheral surface of the fluorescent panel 11, the range in which the cooling medium receives heat and causes convection expands accordingly, and as a result, each point on the surface of the fluorescent panel 11 is temperature deviation becomes smaller. That is,
It is particularly excellent in uniform cooling of the fluorescent panel 11.

The manufacturing procedure for the device according to the third embodiment is to first fix the frame body 14 to the upper surface of the horizontally supported panel 12 with adhesive 16B, and then attach the tube body 10 with the fluorescent panel 11 facing downward. The tube 20 is supported at a predetermined position and inserted through the gap 13 between the outer surface of the tube body 10 and the frame body 14. Next, adhesive 16A is poured through the gap 13 to bond the tube body 10 and frame body 14 together. Thereafter, the cooling medium 22 is injected through the cooling medium inlet 15 formed in the frame 14, and the inlet 15 is closed.

In the step of pouring the adhesive 16A, the tube 20 has a function of preventing the adhesive 16A from flowing into the heat receiving surface 14A of the frame 14, and the adhesive adheres to the heat receiving surface 14A, reducing the heat receiving area. Therefore, the work of forming the watertight space 18 can be performed quickly.

FIG. 5 shows a fourth embodiment of the present invention.

In each of the first to third embodiments, one side edge of the metal frame 14 is made to protrude into the space between the panels 11 and 12, and both panels 11 and 12 cover the one side edge of the metal frame 14. However, in this embodiment, a metal frame 14 is provided at a predetermined position on the outer periphery of the panels 11 and 12, and the structure is such that the panels 11 and 12 are wrapped from the outside.

In this embodiment, an adhesive 16 is applied to the outer surface of the panel 12.
The frame 14 is bonded to the adhesive 16B through the adhesive 16B, and no tensile stress is generated inside the adhesive 16B due to thermal expansion of the cooling medium 22, and only compressive stress acts on the inside of the adhesive 16B. It has the highest strength as a stop structure.

In addition, in the first to fourth embodiments, the tube 20 is arranged around the entire circumference of the part of the sealed space 18 that comes into contact with the adhesive 16, but it is not necessary to arrange the tube 20 around the entire circumference. The tube 20 may be provided only along its length, and the tube 20 need not be provided at a location where it comes into contact with the adhesive 16, but within the watertight space 18 and outside the electron beam irradiation area. It may be arranged at a predetermined length at an arbitrary position.

Furthermore, in the first to fourth embodiments, the adhesive 1
6 is used as a sealing member for the cooling medium 22. However, the fluorescent panel 11 and the transparent panel 12 are fixed by a mechanical fixing means such as a bolt-nut method, and O is used as a sealing member for the cooling medium 22. It goes without saying that the present invention can also be applied when using a ring.

〔Effect of the invention〕

According to the present invention, the compressible member absorbs the thermal expansion of the cooling medium due to the heat generated by the fluorescent surface panel and relieves the stress applied to the sealing member, and since the compressible member is independent from the sealing member, the compressible member To provide a high-brightness liquid-cooled cathode ray tube device that has high structural reliability because there is no leakage of cooling medium due to peeling of adhesive parts with other members or damage to compressible members due to contraction and restoring operations of the tube. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the present invention;
FIG. 2 is a cross-sectional view showing the state of deformation of the tube due to thermal expansion of the cooling medium, and FIG. 3 is a cross-sectional view of main parts showing a second embodiment of the present invention. FIG. 4 is a sectional view of a main part showing a third embodiment of the present invention, FIG. 5 is a sectional view of a main part of a fourth embodiment of the invention, and FIG. 6 is a conventional liquid-cooled cathode ray tube device. FIG. 10... Cathode ray tube body, 11... Fluorescent panel,
11A...electron beam irradiation section, 12...transparent panel,
14...Metal frame body, 14A...Heat receiving surface of metal frame body, 16, 16A, 16B...Adhesive, 18...
Watertight space, 20...tube, 22...cooling medium.

Claims (1)

[Claims] 1. A transparent panel is placed opposite the outer surface of the fluorescent panel of the cathode ray tube body at a predetermined distance apart, and a frame made of a good thermal conductor is placed facing the space between the two panels, and this frame and both the panels A sealing member is interposed between the two panels to form a liquid-tight space between both panels, and a compressible member filled with gas is disposed independent of the sealing member outside the electron beam irradiation area of this liquid-tight space. A liquid-cooled cathode ray tube device characterized in that the liquid-tight space is filled with a light-transmitting cooling medium.